DNotes on Optional Flash Units
Refer to the Speedlight manual for detailed instructions. If the flash unit supports CLS, refer to the section on CLS-compatible digital SLR cameras. The D7100 is not included in the “digital SLR” category in the SB-80DX, SB-28DX, and SB-50DX manuals.
If an optional flash unit is attached in shooting modes other than j, %, and u, the flash will fire with every shot, even in modes in which the built-in flash can not be used.
i-TTL flash control can be used at ISO sensitivities between 100 and 6400. At values over 6400, the desired results may not be achieved at some ranges or aperture settings. If the flash-ready indicator flashes for about three seconds after a photograph is taken, the flash has fired at full power and the photograph may be underexposed.
When an SC-series 17, 28, or 29 sync cable is used for off-camera flash photography, correct exposure may not be achieved in i-TTL mode. We recommend that you select standard i-TTL flash control. Take a test shot and view the results in the monitor.
In i-TTL, use the flash panel or bounce adapter provided with the flash unit. Do not use other panels such as diffusion panels, as this may produce incorrect exposure.
The SB-910, SB-900, SB-800, SB-700, SB-600, and SB-400 provide red-eye reduction, while the SB-910, SB-900, SB-800, SB-700, SB-600, and SU-800 provide AF-assist illumination with the following restrictions:
• SB-910 and SB-900: AF-assist illumination is available with 17–135 mm AF lenses, however, autofocus is available only with the focus points shown at
right.
• SB-800, SB-600, and SU-800:AF-assist illumination is available with 24–105 mm AF lenses, however, autofocus is available only with the focus points
shown at right.
• SB-700: AF-assist illumination is available with 24– 135 mm AF lenses, however, autofocus is available only with the focus points shown at right.
In mode P, the maximum aperture (minimum f-number) is limited according to ISO sensitivity, as shown below:
Maximum aperture at ISO equivalent of:
100 | 200 | 400 | 800 | 1600 | 3200 | 6400 |
4 | 5 | 5.6 | 7.1 | 8 | 10 | 11 |
If the maximum aperture of the lens is smaller than given above, the maximum value for aperture will be the maximum aperture of the lens.
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